Just spotted performing testing on the Nurburgring is the upcoming special X6 M model, which will come in with an even higher power output than the standard X6 M's 555hp.

The power increase is expected to be subtle and will remain under the 600hp mark. There will also be changes to the car's weight and significant changes to the overall feel of the driving experience.

As before, it features a large hood air scoop and air extractor outlets flanking the scoop. No details yet on what exact powerplant or modifications have been applied to the X6 M's motor, but whatever powerplant variant may be under the hood certaintly seems like it needs to move a lot of O2. The other cosmetic enhancement spotted is the addition of more aggressive sideskirts.